Question

Low temperature favours physical adsorption and high temperature favours chemical adsorption.
A.True
B.False

Answer 1

High temperature favors chemical reaction whereas physical adsorption is only bonded by weak forces. The high temperature allows more molecules to possess the required activation energy.

Complete step by step answer:
Adsorption is the process in which the adsorbate gets absorbed on the surface of adsorbent. The particles of adsorbent are present on the surface rather than on the bulk. The term adsorbate and adsorbent are analogous with solute and solvent.
In physical adsorption there is no chemical bond form. The particles are absorbed on the surface with weak Van der Waal forces having weak forces of attraction. The lower the temperature of the gas is, the lower will be the kinetic energy of gas and hence particles will move slower. The particles moving with less speed are easy to get adsorbed, so the lower temperature favors physical adsorption.
In case of chemical adsorption, chemical bonds are formed. For the formation of Chemical bonds the reactant needs to cross the energy level in order to convert into a product. The energy needed is known as activation energy. High temperature provides the activation energy required by the reactant molecules and hence increases the chemical adsorption.

The given statement is true and the correct option is A.

Note:
We should not confuse adsorption with absorption. Adsorption is a surface phenomenon whereas absorption is a bulk phenomenon. The example of adsorption is hydrogen over platinum, dye adsorbed over a piece of charcoal. There is another term known as sorption that is a combination of adsorption and absorption. The example of sorption is dye over sponge.